Supplementary power plant for electric centrals



i. ii. RUTHS.

SUPPLEMENTARY POWER PLANT FOR ELECTRIC CENTRAiS. APPLICATION man SEPI. 25. may

1 5 ggg g 1 5 a 'fsiemed Jan. 18, 1921;

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6 s w s um i OFFICE.

JOI-IANNES KARL RUTHS, OF DJ'URSHOLM, SWEDEN, ASSIGNOR TO AKTIEBOLAGET VAPGRACKUMULAJOR, OF STOCKHOLM, SWEDEN.

SUPPLEMENTARY POVTEP. PLANT FOR ELECTRIC CENTRALS.

Original application filed August 5,

To all whom 2'15 may concern Be it known that I, JoirAXNns KARL RU'rHs, subject of the King of Sweden, residing at Djursholm, in the Kingdon-i of Sweden, have invented certain new and usefullmprovements in Supplementary Power Plants for Electric (entrails, of which the following is a specification.

In order to overcome disturbances in the delivery of power or meet temporary overloads in electric stations or the like plants, equipped with steam reserve, boilers, I have proposed to provide the plant with a heat storer, the water-space of which is connected with the steam-space of the supplementary boiler through a pipe which can be closed otl, so that the plant can be operated with the supplementary boilers or with the heat storer. If desired, a turbine then can be driven from the l-i'e'at3storer. Such an ar rangement is disclosed in mv co-pending application, Ser. 113,395, fi'let Aug. 5, 1916, of which application this is a division. Though the power plant through this provision of a heat storer always will be kept ready for use without keeping the boilers constantly under fireand under pressure a certain time will, however, be Wasted before the turbine can be put in action.

'By the present invention this inconvenience will be avoided and a real momentary reserve obtained so that no disturbance at,- all will be perceivable. by the consumers 1' Through this arrangementthe transformation hitherto necessary for three-phase current into direct current as well as the use of lead accumulators are avoided, as the momentary reserve in threephase-plants willact in e'xactlythe same manner as the lead accumulator in direct-current plants. Tt i-s obvious, that nothing will prevent the use of this arrangement in plants of the kind last mentioned.

Accordingto'niy present invention this is efiected in the following manner. The electric generatondrivm by the steam-turbineis normally running as a synchronous motor, thus driving'the steam turbine idly, while in case of a disturbance this 'syn chronous motor Will run as a generator.

On the drawing; 0 indicates the steam- -motor-for instance a turbine, driving the generator f. b isthe steam boiler battery and h the heat storer, consisting of an insulated Specification of Letters Patent.

Patented J an. 18, 1921.

1918, Serial No. 113,395. Divided and this application filed Septem ber 26, 19.18. Serial No. 255,878

receptacle containing water. Said 'storer through a pipe 111 provided with a valve 71, is charged from the boiler. From the steamspace of. the heat-storer a pipe lr leads to in its casing in that the inlet valve oftlie turbine is provided with a little opening or a narrow hy-pass, through which is suppliedthe little amount of steam, necessary for the cooling of the turbine and tightening of the stutling-box. Y I i t is a centrifugal governor, controlling the valve body of the admission valve o.

The circulating pump u of the condenser (Z may be constantly running. It is. however, more suitable to start it automatically as soon as the turbine c overtakes the driving of the generator 7, while usually a smaller pump supplies the small quantity of cooling water, necessary for the maintenance of the desired vacuum. The air-pump of the condenser must be kept constantly running.

It a disturbance takes places in the plant, owing to a disturbance in the operating of a niotor., a disturbance 'in the power network or an instantaneous unexpected overload,

the frequency of the network will be more or less rapidly diminished according to the size of the total masses, working into the network. The connection between the generator and the network will, however, remain unbroken. The governor t will be put into action and opens at .once the admission.

valve '11 to the turbine c, arranged in the pipe Zr, so that-steam from the heat-storer h 4 will enter the turbine c and the latter will supply the lack of power.

Ia' a disturbance of longer durationdlie steam boilerzbz'ittery 7) at' once will be. heated,

As soon as the boilers can deliver the steam as required, the valve 0 will. be opened, so that front of the valve o as is shown. -VVh'en' the role.

disturbancehas ceased the heat storer pref- .erably will be again charged with steamfrom boiler 72 through thepiping m.

In order to compensate for the losses by radiation from the heat storer h, a small heating apparatusZ is arranged, that main- It then works entirely as (hiring a disturbance. It in this case, steam is drawn off in comparatively large quantities at various times from the heat storer it. one can in order to again charge the heat storer it use one or more of the boilers of the reserve steam boilers Z), it the heating apparatus is not sufiicient.

In the direct pipe from boiler to turbine an additional high pressure turbine may be inserted in order to better utilize the difference in pressure between the boiler and the low-pressure turbine. The" low-pressure turbine then first will be supplied with steam from the heat storer and finally with exhaust-steam from the high-pressure turbine. It is evident the two turbines may form different stages of one and the same turbine. In this case only one generator is necessary.

latter and the said steam generator, a steamturbine and steam connections between the latter and the said steam. storer and the said steam generator respectively, the arrangement being such that thesaid electric generator normally runs as a synchronous motor driving the steam turbine idly, while in case of a disturbance producing a decrease in the frequency of the E. M. F; the electric generator is operated as a generator, the said steamturbine being supplied with steam from said steam-storer.

2. In a power plant as specified in claim 1, a normally closedshut-off valve in the steam connection between the heat storer and the steam-turbine, and a governor adapted to open said valve upon a decrease in the number of revolutions of the electric generator when running as a synchronous motor. I

In testimony whereof I aflix my signature in presence of two witnesses.

J OHANNES KARL RUTHS lVitnesses GRETA PRIM, Lmorrr FaEDRIossoN. 

